Triad Chords

What Is a Triad Chord?

A triad is a chord made of exactly three notes. Those three notes are stacked in intervals of a third — meaning there's always a gap of either two or three semitones between each adjacent pair.

Every triad has the same three components:

• Root — the note the chord is named after (e.g. C in C Major)
• Third — a third above the root (determines major or minor quality)
• Fifth — a third above the third (usually a perfect fifth above the root)

The quality of those intervals — specifically whether the third is major or minor — is what gives each triad its character. A major third sounds bright and open. A minor third sounds darker and more inward. Swap one for the other and you change the entire emotional colour of the chord.

Triads are the harmonic foundation of Western music. Classical, pop, rock, jazz, folk — they all use triads as their structural backbone. Before you can understand seventh chords, chord progressions, or voice leading, you need triads cold.

How to Build a Triad — The Formula

Every triad is constructed by stacking intervals measured in semitones (half steps). One semitone = one fret on guitar, one key on piano.

To build any triad, pick your root note and count up in semitones according to the formula for that chord type. The four formulas are fixed — they never change regardless of which root note you start on.

The 4 Types of Triad

Notice that the major and minor triads both have a perfect fifth (7 semitones) between root and fifth. That's why they sound stable — the perfect fifth is one of the most consonant intervals in music. The diminished triad has a flattened fifth (6 semitones), which is why it sounds tense. The augmented triad has a sharpened fifth (8 semitones), creating that eerie floating quality.

All 12 Major Triads

Apply the major triad formula (Root + 4 + 3 semitones) to every root note and you get these 12 chords. Memorise this table — it's the most used reference in chord-based music.

All 12 Minor Triads

The minor triad formula flips the interval order: Root + 3 + 4 semitones. The fifth is still perfect — only the third drops by a semitone, darkening the whole chord.

Triad Inversions

A triad doesn't have to be played with the root at the bottom. You can rearrange the three notes into any order — these rearrangements are called inversions.

There are three positions for any triad:

All three positions contain identical notes — only the bass note changes. Inversions matter enormously in practice because they let you move smoothly between chords without big jumps. Good voice leading almost always involves inverting chords to find the shortest path from one harmony to the next.

How to Use Triads in Your Playing

1. Build chord progressions

Most songs in any genre are built from a handful of triads drawn from the same key. In C major, the natural triads are C, Dm, Em, F, G, Am, and B diminished. Combine any three or four of those and you have the foundation of thousands of songs.

2. Smooth voice leading with inversions

Instead of jumping from C major (C-E-G) straight to F major (F-A-C) in root position, try keeping two notes stationary and moving only one. C major first inversion (E-G-C) to F major root position (F-A-C) — the C stays put, and only two notes move. That's voice leading, and it's why professional harmony sounds effortless.

3. Arpeggiate for melody and riffs

Play the three notes of a triad one at a time — upward, downward, or in any pattern — and you have an arpeggio. Arpeggios are everywhere: classical etudes, metal guitar intros, pop piano riffs. The triad gives you the raw material; the rhythm and order of the notes makes it musical.

4. Extend to seventh chords

Every seventh chord is just a triad with one more note stacked on top. A C major triad (C-E-G) becomes Cmaj7 by adding the major seventh (B). Understanding the triad underneath any seventh chord makes complex harmony instantly readable. See our Chords guide for the full breakdown.

5. Identify chords by ear

Training yourself to distinguish major from minor by ear — that bright vs dark quality — is one of the highest-leverage skills in music. Once you can hear a major third vs a minor third, you can identify any triad in a song within seconds. That's not a small thing. See our Chord Ear Training guide for a step-by-step method.

Triads in Context — Where They Come From

Triads don't exist in isolation — they're built from scales. Every major scale produces seven triads, one on each scale degree, with a fixed pattern of qualities: major, minor, minor, major, major, minor, diminished.

This pattern is the same in every major key. Learn it once, transpose it to the 12 keys, and you can instantly know which chords belong together in any key signature. That's the foundation of chord progressions — knowing which triads naturally sit within a key.

Minor keys produce a different pattern of qualities, which is why minor-key songs have a different emotional texture. The minor scale page covers the three minor scale variants and the triads each one generates.